Mahy, L., Naze, Y., Rauw, G., Gosset, E., De Becker, M., Sana, H., ...
Aims. We present the results obtained from a long-term spectroscopic campaign devoted to the multiplicity of O-type stars in the young open cluster NGC2244 and in the Mon OB2 association. Methods....
X-Ray Spectroscopy of Stars (2009)
(abridged) Non-degenerate stars of essentially all spectral classes are soft X-ray sources. Low-mass stars on the cooler part of the main sequence and their pre-main sequence predecessors define the...
Spectroscopic and photometric variability of the O9.5Vp star HD93521 (2008)
De Becker, M, Eenens, P, ...
Aims. The line profile variability and photometric variability of the O9.5Vp star HD93521 are examined in order to establish the properties of the non-radial pulsations in this star.
Spectroscopic and photometric variability of the O9.5Vp star HD93521 (2008)
Rauw, G., De Becker, M., Van Winckel, H., Aerts, C., Eenens, P., Lefever, K., ...
The line profile variability and photometric variability of the O9.5 Vp star HD93521 are examined in order to establish the properties of the non-radial pulsations in this star. Fourier techniques...
A binary signature in the non-thermal radio-emitter Cyg OB2 #9 (2008)
Naze, Y., De Becker, M., Rauw, G., Barbieri, C.
Aims: Non-thermal radio emission associated with massive stars is believed to arise from a wind-wind collision in a binary system. However, the evidence of binarity is still lacking in some cases,...
HD148937: a multiwavelength study of the third Galactic member of the Of?p class (2008)
Naze, Y., Walborn, N. R., Rauw, G., Martins, F., Pollock, A. M. T., Bond, H. E.
Three Galactic O-type stars belong to the rare class of Of?p objects: HD108, HD191612, and HD148937. The first two stars show a wealth of phenomena, including magnetic fields and strong X-ray...
New insights into the nature of the SMC WR/LBV binary HD 5980 (2007)
Foellmi, C., Koenigsberger, G., Georgiev, L., Toledano, O., Marchenko, S. V., Massey, P., ...
We present the results of optical wavelength observations of the unusual SMC eclipsing binary system HD 5980 obtained in 1999 and 2004--2005. Radial velocity curves for the erupting LBV/WR object...
The massive star binary fraction in young open clusters I. NGC 6231 revisited (2007)
Sana, H., Gosset, E., Naze, Y., Rauw, G., Linder, N.
We present the results of a long-term high-resolution spectroscopy campaign on the O-type stars in NGC 6231. We revise the spectral classification and multiplicity of these objects and we constrain...
Early-type stars in the core of the young open cluster Westerlund2 (2006)
Rauw, G., Manfroid, J., Gosset, E., Naze, Y., Sana, H., De Becker, M., ...
Aims. The properties of the early-type stars in the core of the Westerlund2 cluster are examined in order to establish a link between the cluster and the very massive Wolf-Rayet binary WR20a as well...
The first orbital solution for the massive colliding-wind binary HD93162 (=WR25) (2006)
Gamen, R., Gosset, E., Morrell, N., Niemela, V., Sana, H., Naze, Y., ...
Since the discovery, with the EINSTEIN satellite, of strong X-ray emission associated with HD93162 (=WR25), this object has been predicted to be a colliding-wind binary system. However,...
An XMM-Newton view of the young open cluster NGC 6231 -- II. The OB star population (2006)
Sana, H., Rauw, G., Naze, Y., Gosset, E.
In this second paper, we pursue the analysis of the 180 ks XMM-Newton campaign towards the young open cluster NGC 6231 and we focus on its rich OB star population. We present a literature-based...
The atypical emission-line star Hen3-209 (2006)
Naze, Y., Rauw, G., Hutsemekers, D., Gosset, E., Manfroid, J., Royer, P.
We analyse observations, spanning 15 years, dedicated to the extreme emission-line object Hen3-209. Our photometric data indicate that the luminosity of the star undergoes marked variations with a...
Naze, Y., Antokhin, I. I., Sana, H., Gosset, E., Rauw, G.
We present the analysis of an extensive set of high resolution spectroscopic observations of HD93161, a visual binary with a separation of 2 arcsec. HD93161 A is a spectroscopic binary, with both...
NGC 6231: X-ray properties of the early-type star population (2004)
Sana, H., Naze, Y., Gosset, E., Rauw, G., Sung, H.
Based on a deep XMM-Newton observation of the young open cluster NGC 6231, we derive the main X-ray properties of its early-type star population. Among the 610 X-ray sources detected in the field, 42...
WR20a: a massive cornerstone binary system comprising two extreme early-type stars (2004)
Rauw, G., De Becker, M., Naze, Y., Crowther, P. A., Gosset, E., Sana, H., ...
We analyse spectroscopic observations of WR20a revealing that this star is a massive early-type binary system with a most probable orbital period of \sim 3.675 days. Our spectra indicate that both...
XMM-Newton observations of the giant HII region N11 in the LMC (2004)
Naze, Y., Antokhin, I. I., Rauw, G.
Using the sensitive XMM-Newton observatory, we have observed the giant HII region N11 in the LMC for \sim30 ks. We have detected several large areas of soft diffuse X-ray emission along with 37 point...
HD108: the mystery deepens with XMM-Newton observations (2004)
Naze, Y., Rauw, G., Vreux, J. M., De Becker, M.
In 2001, using a large spectroscopic dataset from an extensive monitoring campaign, we discovered that the peculiar Of star HD108 displayed spectacular line variations. This strange behaviour could...
WR 20a: A massive cornerstone binary system comprising two extreme early-type stars (2004)
Rauw, G., Becker, M. De, Naze, Y., Crowther, P.A., Gosset, E., Sana, H., ...
We analyse spectroscopic observations of WR 20a revealing that this star is a massive early-type binary system with a most probable orbital period of ~3.675 days. Our spectra indicate that both...
WR bubbles and HeII emission (2003)
Naze, Y., Rauw, G., Manfroid, J.
We present the very first high quality images of the HeII 4686 emission in three high excitation nebulae of the Magellanic Clouds. A fourth high excitation nebula, situated around the WR star...
VLT observations of the highly ionized nebula around Brey2 (2003)
Naze, Y., Rauw, G., Manfroid, J.
We present the first high resolution HeII 4686 images of the high excitation nebula around the WR star Brey 2 in the LMC. This nebula presents a striking morphology: a small arc-like feature some...
The Wind of the B[e] Supergiant Hen S22 Viewed through a Reflection Nebula in DEM L 106 (2002)
Chen, C. -H. R., Danforth, C., Dunne, B. C., Gruendl, R. A., Naze, Y., ...
Narrow-band HST WFPC2 images reveal a bow-shock-like halo around the HII region N30B toward the B[e] supergiant Hen S22 located within the larger DEM L 106 nebula in the Large Magellanic Cloud....
An X-ray investigation of the NGC 346 field in the SMC (2) : the field population (2002)
Naze, Y., Hartwell, J. M., Stevens, I. R., Manfroid, J., Marchenko, S., Corcoran, M. F., ...
We present results from a Chandra observation of the NGC346 cluster, which is the ionizing source of N66, the most luminous HII region and the largest star formation region in the SMC. In the first...
Naze, Y., Hartwell, J. M., Stevens, I. R., Corcoran, M. F., Koenigsberger, G., ...
We present results from a Chandra observation of the NGC346 cluster. This cluster contains numerous massive stars and is responsible for the ionization of N66, the most luminous HII region and the...
The strange case of the massive binary HD149404 (2001)
Naze, Y, Burki, G, Gosset, E, Vreux, JM
We report the analysis of an extensive set of high-resolution spectroscopic observations of the massive binary system HD 149104. W compare different techniques to measure the radial velocities of the...